The synthesis of 5-arylpyrrolo[3,2-b]pyridines and 7-arylpyrrolo[3,2-b]pyridines: Addition of 3-aminopyrroles to aryl enaminones

A series of 5-arylpyrrolo[3,2-b]pyridines 1 was synthesized by addition of 3-aminopyrroles to aryl enaminones. One example of a 7-arylpyrrolo[3,2-b]pyridine 2 was obtained as a minor product along with the 5-aryl isomer, by a modification of the reaction sequence.